Door-latch



F. R. KUHETICH.

DOOR LATCH. Prucmon mso ocr. n. i916.. asumen :une 24. Isls.

Patented Oct. 14, 1919.

Witwe,

. MMU

UNITED STATES l* 'PATENT onirica.

raamt annotrnxunnrrcn, or sUNNYsIDn, UTAH,

i Doon-LATCH.

Srsinatioavf Letters Patent patentado@ 1,4, 191e.

Applition' illed Gmini' lil, 19i6 Serial No; 125,053i' Renewed lune 94'-, 1919. SerialNo. 300,428.

To cll'w'lwm it* may concern:

Be it known that I, FRANK Renchen KURn'ricH, a citizen Iofthe United States, re sidin at Sunnyside, ithe'county of'Carbon and tate of Utah, haveinventedrnew and useful Improvements. in loorliatches, of which theLfello-wing isa specification.

This.l invention relates to door fasteners and more particularly to that classfgenera'lly knownas twin doory atolfies.

The primary objectA of the invention resides inthe production of* a latch of this character wherein the 0 eratin handle of the latch is so constructed as to acilitatethe same in performing a locking action of the vlatch when the same is either locked'or unlocked. l

In carryin out the present invention I contemplate `oi-*min door plate with a slot in which is sli ably mounted tl'i'evsaid operating. handle, and connected" with the latter is the latch operating mechanism whereby upon the movement of 'saidhandle to oneextreme end of theslet Wii'l permit of a partial rotation thereof and perform the locking `action ofthe handle, which in turn locks the latch bolts against movement.

With the above and other objects in view the improvement resides in the consm'uction, combination and arrangement ofV parts set forth in the following specification-and fallincr within the the apperidedtclfaims.

in are drawing; Fi nre 1` isa vertical sectional view taken throli a door' showing-the latch applied thereto and in a lockingpositon, l

Fig. 2 Ais aV perspective'view ofthe latch removed from the door,

F ig. 3 is a detail sectional view clearly illustrating the means for locking the latch bolts against movement, and

Fig. 4 is a detail perspective view of the operating handle.

In carrying out the present invention 5 denotes my improved twin latch and illustrated as applied to a door A swingingly connected in the door casing B.

This twin door latch embodies a door plate 6 secured to the inner face of the door A through the medium of fasteners 7 and positioning the door plate in a vertical plane with respect to the door, While formed centrally in the door plate is a horizontally extending elongatedslot 8 terminating at its opposite ends in enlarged sockets 9. The purpose of such sockets will 'be hereinafter more fully explained as the descrition of the invention 1s proceeded with. ounted upon this plate 6' for vertical slidingA movement and adapted to operate in the guideways 10 secured to said plate, is a pa-ir of latch Abolts 11 and 12 respcctiveiy. Suitable mechanism, indicated neral'ly by the char- :toter 13, isemployed or simultaneously retraeting or extending the oppositely disposed latch bolts 11 and 12 and Lto this end such mechanism embodies a pair of bell crank levers 14 and 15 fulcrumed, as at 16, enst/he doo-rplate 6 to opposite sides of the slot 8 adapting the bell crank levers for verticalswingingrmovement. The Said bell crank level-:5114 and 15 are terminally provided at their outer ends with a transverse slot 17 through which passes the pivot 18, thuspivotaliy connecting each of the latch bolts 11l andi-12 in the slot 17 of the bell crank4 levers. Pivotally connected to the inner extremities 19 of the bell crank levers through thclmedium of the pivot 20 is a vpair of lin s 21" and V22 respectively. The meeting or inner ends of the links overlap one another and loosel( receive the shank 23 of the operating hand e 24. This shank 23 pro trudes through the slot 8 ofthe door plate 6 and is prevented from any accidental displacement f'rom said slot by means of any suitable fastening device, but for the purpose if-'illustration I have shown such device as constituting a disk. Thus it will be seen that by thisfarrangement the o rating han.- dlfe 2% is adapted to slide in tg; slot.8.in a horizontal direction with respect to the door latev and' upon movement'o the handle inv 'die' direction indicated by the arrow in Fig. 2 of the drawing, will draw the links 21 and 22 together and thus rock the Ibell crank levers 14 and 15 upon the fulcrum 16, and in turn simultaneously o erate the latch bolts 11 and 12 in door loc ing position, extending the same in the sockets 25 and 26 connected in the respective upper and lower portions C and D of the door casing B. The operating handle 24 When the latch bolts are in locked position, disposes its shank 23 in the forwardmost socket 9 of the slotv 8 and by the enlargement of this socket presents at the point of formation of the same with the contracted slot 8 horizontal shoulders 27. The shank 23 of the operating handle being provided with opposite iiattened side faces 28, will, upon revolving the roperating handle 24 dispose the flattened side faces crosswise of the slot said flattened side faces to abut With. the horizontal shoulders 27 of the socket, establishing a locking action oi' the latch bolts..

On the other hand when the operating handle 24 is moved to the op osite extremity` of the slot B and 'the shank 2 is disposed in the rearmost socket Si` of the slot, upon a slight revolution of the operating handle will cause the flattened side faces 2S of the shank to be disposed crosswiseox the slot 8 and causing the said faces to abut with the hori zontal shoulders 27 and prevent the latch bolts being moved to locked. position.

From the above description, taken in connection with the accompanying drawing, the simplicity ofthe device, as Well as the advantages thereof will, it is thought, be perfectl apparent to those skilled in the art to W 4ch such invention appertains Without further detailed description.

Having thus described the invention, I claim is:

1. In a twin door latch, the combination with aA door late provided with a horizontally dispose slot at a pointintermediate the top and bottom edges of the plate and terminating at its opposite terminals in en larged sockets presenting shoulders, a pair of oppositely disposed latch bolts slidably mounted lon said plate,'a bell crank-lever pvotally mounted on the plate to opposite sides of the slot and having pivotal connection at one end with each of the latch bolts, an operating handle slidably mounted in said slot, and adink attached to the opposite ends of the bell crank levers and said operating handle for imparting to the levers a rocking movement upon the adjustment of the operating handle in said slot.

2. In a twin door latch, the combination with a door plate provided with a horizpntally disposed slot at a point intermediate the top and bottom edges of the plate and what liopiea of this patent may be obtained for ve cents Washington,

terminating at its opposite terminals in enlargedv sockets resentin shoulders, a pair of oppositely 'isposed atch bolts slidably mounted on said plate, a bell crank lever pivotall mounted on the plate to opposite sides o the slot and having pivotal ,connection at one end with each of 'the latch bolts, anoperatn handleslidably mounted in said slot, a lin connection between the opposite ends of the bell eranklevers and said operating handle for imparting to the levers a rocking' movement upon the adjustment of the operating' handle, in said slot, and means formed integral 'With the operating handle which coacts with the shoulders upon the rotation of the operating handle to hold Vthe bell crank levers against rocking movement.

3. In a tvvm door latch, the combination tally disposed slot at a the top and bottom edges of, the plate, and terminating at its opposite terminals in enlarged lsockets of oppositely disposed latch bolts slidably mounted on said plate, a bell crank lever pivotall mounted .on the plate to opposite sides o the slot and having pivotal conpresenting shoulders, .a pair nection at one end with' each-oi the latch i 4 FRANK niotnttvREiita,

auch, `by aolelressing` the "Geinxiiislloue' ,ef istante.

D. c. f

mounted 1n the ov'er. 

